This error typically affects the vehicle's immobilizer system, which may result in:
A standard battery disconnection can corrupt French vehicle modules if done improperly. Use the official Peugeot BSI reboot procedure to discharge corrupt memory caches:
Let’s move from theory to action. Below is a step-by-step diagnostic and repair approach organized from simplest to most complex.
Positioned near the steering column or within the center console slot, this antenna transmits a low-frequency radio wave to power up and read the chip inside your key fob. b173d peugeot
: Many electronic communication errors can be cleared by performing a "soft reboot" of the BSI module. This involves a specific sequence of disconnecting and reconnecting the battery.
The Peugeot fault code identifies a failure in the recognition of the mechanical or electronic key (or remote control) by the vehicle's immobiliser system. This diagnostic trouble code (DTC) is commonly associated with Peugeot and Citroën vehicles, particularly when the car fails to start or displays a "key not detected" warning. Understanding B173D: Causes and Symptoms
If the simple steps don't work, you will need to dig deeper. Positioned near the steering column or within the
user wants a long article about "b173d peugeot". I need to gather comprehensive information about this fault code. The search plan suggests several search queries to cover different aspects. I will execute these searches simultaneously to gather initial results. initial search results show several relevant pages. I need to gather more detailed information. I will open some of these pages, including the Chinese result, the Peugeot forums, the diagnosis page, and any other relevant links. search results have provided a good amount of information. The next step is to gather more specific information related to symptoms, causes, fixes, BSI reset, immobilizer, key, and technical service bulletins. I will execute the next set of searches. search results for symptoms, causes, and TSB were not very fruitful. However, I have gathered substantial information from the previous results. I will now structure the article based on the available information. The article will cover: introduction, what the code means, common symptoms, root causes and diagnostics, step-by-step solutions, prevention, and conclusion. I will cite the relevant sources. Understanding and Fixing Peugeot Fault Code B173D: Your Comprehensive Guide
A fault in the ECU controlling the engine immobilizer (Code B1808).
This issue is rarely a simple mechanical failure. It is almost always a failure in the communication between the key, the key reader, and the BSI module. The Peugeot fault code identifies a failure in
This code is common across PSA Group vehicles (Peugeot and Citroën) and generally prevents the engine from starting because the security system does not "see" a valid key. The car will not start or crank.
: If a remote control button is pressed repeatedly out of range of the vehicle, its rolling code counter can lose alignment with the BSI memory.
The first step is always the same: write down all codes, clear them using a professional-grade diagnostic tool (e.g., Diagbox, PP2000, or equivalent), then take the vehicle for a 10-15 minute drive. Re-scan the system to see which codes return immediately. A code that returns instantly is likely a genuine, persistent fault. Codes that don’t return were likely stored as intermittent events.
If your Peugeot is throwing the B173D code, you can follow these steps to narrow down the issue:
: Difficulties locking or unlocking the vehicle remotely. Common Causes